Lycoming Engines is a U.S. aircraft engine company, known primarily for its general aviationengines. It also has manufactured engines used in agriculture. For most of its history Lycoming has been part of the AVCO group as AVCO Lycoming. In 1987 AVCO was purchased by Textron to become Textron Lycoming. In 2002, the company was renamed Lycoming Engines.[1]

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Lycoming claims to have been founded in 1845 by "Madame Ellen Curtis Demorest"[1]; however, the early history of the company (especially prior to 1860) is unclear[2]. (Biographer Ishbel Ross notes that the marriage of Ellen Louise Curtis to William Jennings Demorest took place in 1858, somewhat later than the purported date of establishment of the company.[2]) In New York, New York, between c. 1860 and 1887, the Demorests published fashion magazines and operated the Demorest Fashion and Sewing-Machine Company (sometimes known as the Demorest Manufacturing Company) producing "Madame Demorest" and "Bartlett & Demorest" sewing machines and selling Ellen Demorest's innovative paper patterns for dressmaking.[2] During this period, Ellen Demorest patented several fashion accessories[3][4], while her husband patented improvements to sewing machines[2] and an apparatus for the vulcanization of rubber[5][6].

A Demorest print advertisement

Around 1883, Gerrit S. Scofield & Frank M. Scofield (advertising agents from New York) bought the Demorest brand and the sewing machine business (the Demorests retained the magazine business), and constructed a factory in Williamsport, Pennsylvania (in Lycoming County).[2][7] At the urging of the newly-established Williamsport Board of Trade, citizens invested US$100 000 into the new manufacturing facility, which employed 250.[2] The factory produced 50 to 60 sewing machines per day, and the company sold them for between US$19.50 and US$55.00 each.[8]
With the development of the "New York Bicycle" in 1891 (designed by employee S. H. Ellis), the company diversified its product offerings.[2][8] Until the early 1900s, the factory produced sewing machines, bicycles, typewriters, opera chairs and other products.[1][2][8]

By 1907, the manufacture of sewing machines had become unprofitable for Demorest, and the company was sold and restructured as the Lycoming Foundry and Machine Company, shifting its focus toward automobile engine manufacture.[1][2] In 1910, the company supplied its first automobile engine to Velie[9], and during the early post-World-War-I era, the company was a major supplier to Auburn (which produced the Auburn, Cord, and Duesenberg lines). Eventually Lycoming became Auburn's principal supplier, and in 1927 Errett Lobban Cord bought the company[9], placing it under his Auburn Manufacturing umbrella group. In 1929, Lycoming produced its first aviation engine, the nine-cylinder R-680radial.[1] This was a fairly successful design, and was used widely in light aircraft, including Cord's Travel Air.

In the 1930s, Lycoming made a number of attempts to develop successful high-power aircraft engines. The 1 200 hp (895 kW)O-1230 was Lycoming's attempt to produce an engine based on the USAAC's hyper engine concept, and used a variety of features to produce nearly 1 hp/in3 (46 kW/L) of engine displacement. However, by the O-1230's entry into service, it had been surpassed by other designs and the US$500 000 investment was not recouped. Another attempt was made to rescue the design by stacking two O-1230s to make the 2 300 hp (1 700 kW)H engineH-2470 but the only design to use it, the P-54, never entered production. The Curtiss XF14C was originally intended to be powered by the H-2470, but the engine's poor performance led to the adoption of an alternative radial engine on the prototype. (The XF14C did not enter production.)

Undeterred by the O-1230/H-2470's failure, Lycoming turned to an even larger design, the R-7755, the largest aviation piston engine ever built. This design also experienced problems, and was only ready for use at the very end of World War II, when the aviation world was turning to jet engines to power future large aircraft. There was apparently some interest in using it on the Convair B-36bomber, but the Pratt & Whitney R-4360 was used instead.

In 1939 Cord re-organized all of his aviation holdings into the AVCO group, at which point the engine manufacturing company became "AVCO Lycoming". They also leased a government-owned plant in Stratford, Connecticut and produced Wright radials under license. After the war, this plant was converted to produce the T53turboshaft engine, one of their more successful designs. From this point on the piston and turbine engine lines remained separate, with the piston lines being built in the original Williamsport factories, and turbines in Stratford.

Their most successful post-war products were a series of air-cooledflat-4 and flat-6general aviation engines. Most famous among these are the O-235 and O-360 four-cylinder engines, and the O-540 six-cylinder engine. Many light aircraft are powered by versions of these engines, with power ratings in the 100–360 hp (75–270 kW) range. Engines in this series also include the O-320 four-, O-580 six- and O-720 eight-cylinder engines, and the advanced turbocharged and fuel-injected450 hp (340 kW)TIGO-541 variant of the venerable (carbureted) O-540.

In the early 1980s, the general aviation market suddenly diminished and Lycoming's piston engine business was significantly impacted. Attempts were made to move some of the turbine production to Williamsport but this led to a series of quality control problems and eventually it was abandoned.

Another attempt to rescue Williamsport was made in introducing the "radical" SCORE engine, a Wankel engine originally developed in a partnership between Curtiss-Wright and John Deere. Curtiss-Wright lost interest in the design just as it was maturing and sold it to Deere, who brought in Lycoming to sell into the aviation markets. They were guaranteed a startup run by Cessna, also owned by Textron. Just as production was ready to start, Cessna announced they were halting their small-aircraft business for an indefinite period, and SCORE was cancelled. The remains of the Deere licenses were later purchased by Rotary Power International, which briefly produced a 340 hp (254 kW) version.